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[PATCH] sky2: remove MSI support 

Remove Message Signaled Interrupt support (for 2.6.16).
MSI is inherently edge-triggered and that is incompatiable (without more
work) with NAPI.

In future, will replace with smarter lockless-IRQ handling like
tg3.c

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Stephen Hemminger 2006-02-27 13:13:54 -08:00 committed by Jeff Garzik
parent ce7eeb6b52
commit 958ddb75b0
2 changed files with 0 additions and 78 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

77
drivers/net/sky2.c
View File

@ -96,10 +96,6 @@ static int copybreak __read_mostly = 256;
module_param(copybreak, int, 0);
MODULE_PARM_DESC(copybreak, "Receive copy threshold");
static int disable_msi = 0;
module_param(disable_msi, int, 0);
MODULE_PARM_DESC(disable_msi, "Disable Message Signaled Interrupt (MSI)");
static const struct pci_device_id sky2_id_table[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_SYSKONNECT, 0x9000) },
{ PCI_DEVICE(PCI_VENDOR_ID_SYSKONNECT, 0x9E00) },
@ -3126,61 +3122,6 @@ static void __devinit sky2_show_addr(struct net_device *dev)
dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
}
/* Handle software interrupt used during MSI test */
static irqreturn_t __devinit sky2_test_intr(int irq, void *dev_id,
struct pt_regs *regs)
{
struct sky2_hw *hw = dev_id;
u32 status = sky2_read32(hw, B0_Y2_SP_ISRC2);
if (status == 0)
return IRQ_NONE;
if (status & Y2_IS_IRQ_SW) {
sky2_write8(hw, B0_CTST, CS_CL_SW_IRQ);
hw->msi = 1;
}
sky2_write32(hw, B0_Y2_SP_ICR, 2);
sky2_read32(hw, B0_IMSK);
return IRQ_HANDLED;
}
/* Test interrupt path by forcing a a software IRQ */
static int __devinit sky2_test_msi(struct sky2_hw *hw)
{
struct pci_dev *pdev = hw->pdev;
int i, err;
sky2_write32(hw, B0_IMSK, Y2_IS_IRQ_SW);
err = request_irq(pdev->irq, sky2_test_intr, SA_SHIRQ, DRV_NAME, hw);
if (err) {
printk(KERN_ERR PFX "%s: cannot assign irq %d\n",
pci_name(pdev), pdev->irq);
return err;
}
sky2_write8(hw, B0_CTST, CS_ST_SW_IRQ);
wmb();
for (i = 0; i < 10; i++) {
barrier();
if (hw->msi)
goto found;
mdelay(1);
}
err = -EOPNOTSUPP;
sky2_write8(hw, B0_CTST, CS_CL_SW_IRQ);
found:
sky2_write32(hw, B0_IMSK, 0);
free_irq(pdev->irq, hw);
return err;
}
static int __devinit sky2_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
@ -3302,20 +3243,6 @@ static int __devinit sky2_probe(struct pci_dev *pdev,
}
}
if (!disable_msi && pci_enable_msi(pdev) == 0) {
err = sky2_test_msi(hw);
if (err == -EOPNOTSUPP) {
/* MSI test failed, go back to INTx mode */
printk(KERN_WARNING PFX "%s: No interrupt was generated using MSI, "
"switching to INTx mode. Please report this failure to "
"the PCI maintainer and include system chipset information.\n",
pci_name(pdev));
pci_disable_msi(pdev);
}
else if (err)
goto err_out_unregister;
}
err = request_irq(pdev->irq, sky2_intr, SA_SHIRQ | SA_SAMPLE_RANDOM,
DRV_NAME, hw);
if (err) {
@ -3332,8 +3259,6 @@ static int __devinit sky2_probe(struct pci_dev *pdev,
return 0;
err_out_unregister:
if (hw->msi)
pci_disable_msi(pdev);
if (dev1) {
unregister_netdev(dev1);
free_netdev(dev1);
@ -3376,8 +3301,6 @@ static void __devexit sky2_remove(struct pci_dev *pdev)
sky2_read8(hw, B0_CTST);
free_irq(pdev->irq, hw);
if (hw->msi)
pci_disable_msi(pdev);
pci_free_consistent(pdev, STATUS_LE_BYTES, hw->st_le, hw->st_dma);
pci_release_regions(pdev);
pci_disable_device(pdev);

1
drivers/net/sky2.h
View File

@ -1881,7 +1881,6 @@ struct sky2_hw {
u32 intr_mask;
int pm_cap;
int msi;
u8 chip_id;
u8 chip_rev;
u8 copper;